The God of the Old Testament is not the Father of Jesus Christ.
A heresy denies the Gospel or the God it reveals (Galatians 1:8).
Where It Began
Marcion, a wealthy shipowner from Sinope on the Black Sea, came to Rome around 140. About 144 the Christians at Rome separated from him. He organized rival churches with their own bishops, and they spread across the empire, surviving in places such as Syria into the fifth century.
Marcion assembled his own Bible: an edited Gospel of Luke and ten letters of Paul, with passages he judged too Jewish removed. A companion work, the Antitheses, set sayings of the Old Testament against sayings of the Gospel.
The People Involved
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Why This Is Dangerous
It tears the Bible in two and denies that the God of Abraham is the Father of Jesus Christ. Without the Old Testament's law, sacrifices, and promises, no one can fully understand why Christ had to die.